1561311405104 has 20 divisors (see below), whose sum is σ = 3300044561160. Its totient is φ = 709687002240.

The previous prime is 1561311405083. The next prime is 1561311405107. The reversal of 1561311405104 is 4015041131651.

It is not an unprimeable number, because it can be changed into a prime (1561311405107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4435543589 + ... + 4435543940.

It is an arithmetic number, because the mean of its divisors is an integer number (165002228058).

Almost surely, 2^{1561311405104} is an apocalyptic number.

It is an amenable number.

1561311405104 is an abundant number, since it is smaller than the sum of its proper divisors (1738733156056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1561311405104 is a wasteful number, since it uses less digits than its factorization.

1561311405104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8871087548 (or 8871087542 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 32.

Adding to 1561311405104 its reverse (4015041131651), we get a palindrome (5576352536755).

The spelling of 1561311405104 in words is "one trillion, five hundred sixty-one billion, three hundred eleven million, four hundred five thousand, one hundred four".